Determination of optimal degree days of fasting before slaughter in rainbow trout (Oncorhynchus mykiss)

Bermejo-Poza, Rubén and Fuente, Jesús de la and Pérez, Concepción and González de Chavarri, Elisabet and Teresa Díaz, María and Torrent Bravo, Fernando and Villarroel Robinson, Morris Ricardo (2017). Determination of optimal degree days of fasting before slaughter in rainbow trout (Oncorhynchus mykiss). "Aquaculture", v. 473 ; pp. 272-277. ISSN 0044-8486. https://doi.org/10.1016/j.aquaculture.2017.01.036.

Description

Title: Determination of optimal degree days of fasting before slaughter in rainbow trout (Oncorhynchus mykiss)
Author/s:
  • Bermejo-Poza, Rubén
  • Fuente, Jesús de la
  • Pérez, Concepción
  • González de Chavarri, Elisabet
  • Teresa Díaz, María
  • Torrent Bravo, Fernando
  • Villarroel Robinson, Morris Ricardo
Item Type: Article
Título de Revista/Publicación: Aquaculture
Date: 2017
ISSN: 0044-8486
Volume: 473
Subjects:
Freetext Keywords: Food deprivation, Water temperatura, Rainbow trout ,Cortisol, pH
Faculty: E.U.I.T. Forestal (UPM)
Department: Ingeniería y Gestión Forestal y Ambiental
Creative Commons Licenses: Recognition - No derivative works - Non commercial

Full text

[img]
Preview
PDF - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (830kB) | Preview

Abstract

Pre-slaughter fasting is a common practice in aquaculture to ensure emptying of the digestive tract, but little is known about how long fish should be fasted, in terms of degree days (°C d), to clear the gut without affecting their welfare or flesh quality. In this study, 180 rainbow trout (Oncorhynchus mykiss) were fasted for 3, 4, 5, 6, 7 and 9 days (17.2, 22.3, 28.6, 35.3, 41.8 and 55.3 °C d, respectively) and different morphometric, hematological and flesh quality parameters were measured. The slaughter weight, relative growth and hepato-somatic index did not decrease until after 7 days of fasting (41.8 °C d) and stomach content was similar and near zero after 4 days of fasting (22.3 °C d). Conversely, fasting time increased carcass yield. Plasma concentrations of cortisol, glucose and creatine phosphokinase enzyme were lower with increasing days of fasting. However, trout slaughtered after 5 days of fasting (28.6 °C d) had a higher flesh pH at 0 hours post-mortem than 3 and 4 days fasted trout and, consequently, earlier establishment of rigor mortis. Furthermore, liver color could be useful as a stress indicator since its hue decreases after 5 days of fasting (28.6 °C d). In conclusion, a pre-slaughter fasting period from 17.2 ° C d to 22.3 ° C d makes possible to obtain a complete emptying of the digestive system in rainbow trout and simultaneously it can minimize the stress response with consequent better flesh quality.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainAGL2010-19479UnspecifiedUnspecifiedUnspecified
Government of SpainAGL2013-45557-PUnspecifiedUnspecifiedUnspecified

More information

Item ID: 50497
DC Identifier: http://oa.upm.es/50497/
OAI Identifier: oai:oa.upm.es:50497
DOI: 10.1016/j.aquaculture.2017.01.036
Official URL: https://www.sciencedirect.com/science/article/pii/S0044848616307001
Deposited by: Memoria Investigacion
Deposited on: 04 May 2018 09:01
Last Modified: 30 Apr 2019 12:59
  • Logo InvestigaM (UPM)
  • Logo GEOUP4
  • Logo Open Access
  • Open Access
  • Logo Sherpa/Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Logo Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Logo de Recolecta
  • Logo del Observatorio I+D+i UPM
  • Logo de OpenCourseWare UPM